Densitometric sensing device for use in printing presses

Details Densitometric sensing device for use in printing presses Densitometric sensing device for use in printing presses

1987-09-14

1989-02-21

Rosenberger, Richard A.

Optics: measuring and testing

Of light reflection

356380, G01N 2147

Patent

active

048060020

ABSTRACT:
A densitometric sensing device in which a density measuring head, which is part of the device, traverses an ink test strip printed on a page which is fed to or placed on the device. The problem of misalignment between the thus-placed ink test strip and the scanning direction of the density measuring head is avoided by providing a plurality of density measuring receivers in the measuring head, mounted transverse to the direction of travel so that the ink test strip is always under some of the receivers. The measured density values of all of the receivers are passed to a comparison circuit which cooperates with a logic circuit to determine from the values of the signals themselves which should be used to produce a composite density value, which is then used as the density for the zone being scanned.

REFERENCES:
patent: 3567923 (1971-03-01), Hutchison
patent: 3756725 (1973-09-01), Manring
patent: 4512662 (1985-04-01), Tobias

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